Utah Code § 16-10a-807: Resignation of directors.

(1) A director may resign at any time by giving a written notice of resignation to the board of directors, the board's chair, or the corporation's secretary.

(2)

(a) A resignation of a director is effective when the notice is received by the corporation unless the notice specifies a later effective date or an effective date determined by the happening of an event.

(b) A notice of resignation that is conditioned upon failing to receive a specified vote for election as a director may provide that it is irrevocable.

(3) A director who resigns may deliver to the division for filing a statement of the director's resignation pursuant to Section 16-10a-1608.